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Wireless sensor networks (WSNs) are composed of large numbers of minimal capacity sensing computing, and communicating devices. These devices operate in complex and noisy environments. Transient and permanent random failures are commonplace. The considerable redundancy in such systems creates great potential for designing them to continue to provide their specified services even in the face of large numbers of such failures. WSNs are also susceptible to malicious, non-random security attacks. For example, a wireless sensor network deployed in remote regions to detect and classify targets could be rendered inoperative by various security attacks. To meet realistic requirements, WSNs must be able to continue to operate satisfactorily in the presence of, and to recover effectively from, security attacks. We propose that safe self-healing and adaptive infrastructures can work together to permit WSNs to continue to operate and self-heal in the presence of failures and security attacks.